global system for mobile communications history
Multiple Access Protocols for Mobile Communications - GPRS, UMTS and Beyond
Ngày tải lên :
02/03/2013, 16:59
... which are discussed extensively
in Chapter 4.
For one 2G system called cdmaOne and most 3G systems, e.g. the Universal Mobile
Telecommunications System (UMTS), DS/CDMA was chosen as a basic multiple ... Communication Systems 25
2.2.1 Analogue First Generation Cellular Systems 25
2.2.2 Digital Second Generation Systems 25
2.3 First 3G Systems 27
2.3.1 Requirements for 3G 27
2.3.2 Evolution of 2G Systems ... Models for the Physical Layer and for User Traffic Generation 221
5.1 How to Account for the Physical Layer? 221
5.1.1 What to Account For and How? 221
5.1.2 Using Approximations for Error Performance...
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GSM Global System for Mobiles
Ngày tải lên :
19/10/2013, 15:15
... Network
OMC
AUC
HLR
MSC
EIRVLR
BSC
BTS
MS
External
PSTN &
PDN N/W
SS
BSS
Switching
System
Base Station
System
MS
Mobile Station
BTS
Base transceiver System
BSC
Base Station Controller
MSC
Mobile Switching Center
HLR
Home Location ... messages
ã International Mobile Equipment Identifier (IMEI)
38
GSM Architecture
HLR
VLR
EIR
AUC
MSC
B
S
C
B
S
C
SMSC
PSTN
VMSC
Mobile
Station
GSM
Air interface
OMCR
TRAU
Base Station System
Network and ... Circuit Switched Data
EDGE = Enhanced Data rate for GSM Evolution
UMTS = Universal Mobile Telecommunication System
10 sec 1 min 10 min 1 hour0
UMTS
E/GPRS
ISDN
PSTN
GSM
webe-mail photo
web photo
e-mail
web...
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IP for 3G - Networking Technologies for Mobile Communications
Ngày tải lên :
27/10/2013, 17:15
... bibliographical references and index.
ISBN 0-471-48697-3
1. Wireless Internet. 2. Global system for mobile communications. 3. TCP/IP (Computer
network protocol) I. Eardley, Philip. II. Burness, ... paths for
them are handled by the SGSN.
1.2.3 IP for 3G
What is meant by IP for 3G? 3G systems will include IP multimedia allowing the user to
browse the Internet, send e-mails, and so forth. ... being captured for malicious use and impersonation of
users.
One, final, level of security is performed on the mobile equipment itself, as opposed to the
mobile subscriber (for example, putting...
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Tài liệu 68 Array Processing for Mobile Communications pdf
Ngày tải lên :
16/12/2013, 04:15
... Center for Telecom-
munications and Information Systems Laboratory, Stanford University, Stanford, CA, June
1994.
[2] Second workshop on smart antennas in wireless mobile communications, Center for ... selection performance analysis of a switched
multi-beamantenna systemin mobile communications environments, Stanford, CA,July 1995.
Second workshop on Smart Antennas in Wireless Mobile Communications.
[28] ... Telecom-
munications and Information Systems Laboratory, Stanford University, Stanford, CA, July
20-21, 1995.
[3] Third workshop on smart antennas in wireless mobile communications, Center for Telecom-
munications...
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Sprite: A Simple, Cheat-Proof, Credit-Based System for Mobile Ad-Hoc Networks potx
Ngày tải lên :
15/03/2014, 04:20
... bandwidth and storage requirement.
B. System performance vs. network resource
We next evaluate the performance of our system. One major
metric of the performance of our system is the message success
rate, ... Sprite, a simple, cheat-proof, credit-
based system for stimulating cooperation among selfish nodes in
mobile ad hoc networks. Our system provides incentive for mobile
nodes to cooperate and report actions ... discussed in Sec-
tion III, although our system provides incentive for cooperation
by giving more credit for forwarding a message, whether or
not to forward a specific message will depend on the...
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hsdpahsupa for umts high speed radio access for mobile communications
Ngày tải lên :
01/06/2014, 09:38
... described in Chapter 4.
14 HSDPA/HSUPA for UMTS
HSUPA
HARQ for
uplink
Fast Node B scheduling
for uplink
Shorter TTI
for uplink
Figure 2.4 The techniques chosen for the HSUPA work item.
Work items
created
Feasibility
study
started
Impact ... Pedersen
7.1 General performance factors 123
7.1.1 Essential performance metrics 124
7.2 Single-user performance 125
7.2.1 Basic modulation and coding performance 126
7.2.2 HS-DSCH performance 128
7.2.3 ... responsible for physical layer aspects;
. TSG RAN WG2: responsible for layer 2 and 3 aspects;
. TSG RAN WG3: responsible for RAN internal interfaces;
. TSG RAN WG4: responsible for performance and...
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fixed broadband wireless system design the creation of global mobile communications
Ngày tải lên :
03/06/2014, 00:52
... the system operation before the system is
actually built. If the modeling process shows that the system performance is inadequate,
then the design can be adjusted until the predicted performance ... processes the power in an effort to recover exactly the source information
that was originally transmitting. For some systems this process can be quite complex, with
methods for decoding signals, correcting ... transmitted source information is a broad general measure
of the quality of the communication system and the success of the system design.
20 FIXED BROADBAND WIRELESS SYSTEMS
challenges to system designers...
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Multicarrier Techniques for 4G Mobile Communications
Ngày tải lên :
26/04/2013, 09:50
... Techniques for 4G Mobile Communications, Shinsuke Hara
and Ramjee Prasad
OFDM for Wireless Multimedia Communications, Richard van Nee and
Ramjee Prasad
Radio over Fiber Technologies for Mobile Communications ... present and future mobile communi-
cations systems. As an evolutional form of mobile phone systems, Interna-
tional Mobile Telecommunications (IMT)-2000 [4, 5], which corresponds
to 3G systems, aims ... (2G) systems in the 1990s, such as
Global Systems for Mobile Telecommunications (GSM) [1], Personal Digital
Cellular (PDC) [2], and Interim Standard (IS)-95 [3], on digital technologies
for voice-oriented...
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Tài liệu Multicarrier Techniques for 4G Mobile Communications P1 docx
Ngày tải lên :
20/01/2014, 23:20
... present and future mobile communi-
cations systems. As an evolutional form of mobile phone systems, Interna-
tional Mobile Telecommunications (IMT)-2000 [4, 5], which corresponds
to 3G systems, aims ... (2G) systems in the 1990s, such as
Global Systems for Mobile Telecommunications (GSM) [1], Personal Digital
Cellular (PDC) [2], and Interim Standard (IS)-95 [3], on digital technologies
for voice-oriented ... 1
Introduction
1.1 Mobile Communications Systems: Past, Present, and
Future
There has been a paradigm shift in mobile communications systems every
decade. The first generation (1G) systems in the...
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Tài liệu Multicarrier Techniques for 4G Mobile Communications P doc
Ngày tải lên :
20/01/2014, 23:20
... Propagation and Subsystems Research for the Evolution
of Mobile Communications, ’’ IEEE Comm. Mag., Vol. 34, No. 2, February 1996,
p. 58.
[2] Prasad, R., Universal Wireless Personal Communications, ... Communication Systems and Techniques,
New York: IEEE Press, 1996.
[4] Jakes, Jr., C., Microwave Mobile Communications, New York: John Wiley & Sons,
1974.
[5] Lee, W. C. Y., Mobile Communications ... rectangular pulse waveforms for
subcarriers, the frequency spectra of the waveforms are widely spread and
overlapped [see Figure 3.3(b)], although it can save the required bandwidth.
Therefore, the concept...
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iCare: A Mobile Health Monitoring System for the Elderly pptx
Ngày tải lên :
28/03/2014, 19:21
... personal health information
system and the medical guidance.
1) Personal health information system: The personal
health system can store physiological data and other
information in the database ... health information system which allows
doctors to view current and history condition of the elderly,
set thresholds for sensors and give advices remotely, which
is the essential part for tele-monitoring ...
Our system is also a mobile health system for the elderly
with tailored services depending on their personal health
condition. However, it is not only a remote and real-time
monitoring system...
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wcdma for umts radio access for third generation mobile communications
Ngày tải lên :
03/06/2014, 01:37
... supported by the standard
8 WCDMA for UMTS
1.2 Air Interfaces and Spectrum Allocations for Third
Generation Systems
Work to develop third generation mobile systems started when the World Administrative
Radio ... commercial operation schedule for WCDMA
6 WCDMA for UMTS
References
[1] Pirhonen, R., Rautava, T. and Penttinen, J., ‘TDMA Convergence for Packet Data Services’, IEEE
Personal Communications Magazine, ... link
performance and enhances downlink capacity. It requires new functionalities in the mobile,
such as SIR estimation and outer loop power control, that are not needed in IS-95 mobiles.
The IS-95 system...
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A Fast File System for UNIX
Ngày tải lên :
12/09/2012, 14:16
... McKusick, M., "Performance Effects of Disk Subsystem Choices
for VAX Systems Running 4.2BSD UNIX", Computer Systems Research Group,
SMM:05-12 A Fast File System for
UNIX
administration ... byte block
UNIX file system. The new file system uses less space than the 512 byte or 1024 byte file systems for
indexing information for large files and the same amount of space for small files. These ... [Operating Systems]: Performance −
measurements, operational analysis; H.3.2 [Information Systems]: Information Storage − file organization
Additional Keywords and Phrases: UNIX, file system organization,...
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A web-based system for notifying environment violation.doc
Ngày tải lên :
27/10/2012, 16:40
... 13
Web-based Geographic Information System 13
3.1. Geographic Information System overview 13
3.1.1. Definition 13
3.1.2. Data representation in GIS system 13
3.1.3. Other terms in GIS system 15
3.1.3. ... according its permission.
4.3. System architecture
GreenPeace applied the three-tier architecture for dynamic web based system. It
combines rich client design and web-based GIS system at presentation ... of Java Platform that runs on the web-based. Java binary
codes may be downloaded to browser before processing.
- Microsoft Silverlight: The newest web platform from Microsoft to perform
logic...
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